JPH06510894A - Digital telephones, cable television systems and local exchange bypass networks - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention utilizes existing cable television equipment to create a complete telephone system. Concerning cordless telephones that send high-speed packets of information to remote exchanges.

1 puff amount Cable television is used as another local loop to replace telco (telephone company) copper wire. The use of bisystems has been proposed many times over the years. For each phone Some systems have been created that use separate frequency-division multiplexed carriers. However, the economics may not be competitive or the performance may not be entirely satisfactory. It wasn't. Distribution pedestal supplying both television and telephone to a residential complex PCN (Personal Communication Network) ) an optical fiber that carries analog cable television signals along with digital voice telephone signals Several systems have been proposed that use wires. Today, such alternative technologies is more costly than current separate telephone equipment and separate cable television systems. (Johnson, Leland L, and D avidP, Reed, RESIDENTIAL BROADBAND 5 ERVICES BY SET EPHONE COMPANIES, THE RA ND Corp, June 1990) 0 optical fiber cable is a new Increasingly used in TV cables and rebuilt cable television systems, carry programs from the cable television head end to the feeder cable network. It replaces the large diameter coaxial backbone cable. TV signal is optical fiber It is transmitted in fiber cables using AM (sometimes FM) modulation. these is converted into an electrical signal at the feeder cable connection point. This allows you to Higher quality TV performance at a price comparable to all coaxial cable TV systems Noh is produced (Chiddex.

Ja+tes, -FIBER0PTIMPLEMENTATION: A CASE 5TUDY-.

Communications Engineering and Design n, 5ept, 1989. (See p. 8).

PCNs using small radio telephones were developed in Europe, the Far East, and the United States.

In the United States, exclusivity like the experience of a cellular wireless license is An excessive number of applicants are seeking PCN licenses from the FCC in the hope that I am applying. In the case of cellular radios, resold at high prices to the final system builder. Peno <- licenses were issued by lottery for the purpose of

The most relevant prior art to the present invention has been found by Jerrold di vision of General Instruments, Co. able TV Laboratories, Denver, Colorado This is a recent proposal set out in a public presentation by O. Cable TV Laboratories is a consortium of cable T This presentation is sponsored by V operators. errold uses a TV to connect PCN type telephone equipment to the central telephone office. Suggested using cable. PCN is a low power cellular method and A base station can be configured at a lower cost than traditional cellular radio. early on PCN is used to refer to wireless telephone calls that can only make calls. It was. However, this definition of PCN has evolved in the direction of making and receiving calls. There is one. Shorter range PCNs are generally up to 600 meters, longer ranges lower power levels than required by cellular radios are possible. Also, this low power larger, more powerful cellular radio telephones by requiring only Also the battery life between charges is longer and the smaller hand belt charger You will be able to use speaking equipment.

In Jerrold's proposal, the PCN signal inside a single house would be is received by the active connection unit physically connected to the end of the cable. Ru. These signals are routed upstream (“upstream” is cable television) via a drop cable. ``downstream'' refers to the direction of the end, and ``downstream'' refers to the direction of the terminal device). . The drop cable is connected to the TV feeder cable. used inside the house Active connection units include amplifiers, AGC control circuits, and microcontrollers. processor and strong PCN signals that suppress other signals on the cable. Equipped with a varilloset (amplitude limiting device) that provides a signal averaging function to prevent It is growing. The described configuration provides a PCN equipment signal on a cable television system. Create a transmission path for frequency division of the signal.

Overcomes the limitations of known proposals and has better potential than known alternative systems. Cable TV and telephone, which appear to offer higher functionality at lower cost. It would be desirable to have a system that describes the combined use of more specific is a system that adds telephone and data capabilities to an existing cable television system. A special addition to cable television systems using fiber-feeder configurations It would be desirable to have a system that is applicable. Furthermore, the complete end- It would be desirable to have an end solution. This is inside the cordless telephone equipment. It begins with a cell relay packet that is generated and from there is transmitted throughout the cable television system. ATM (asynchronous time multiplexing) for connection to high-speed packet switches. 5ONET (synchronous optical network) optical fiber system operating in ) mode seamlessly interconnect with systems. The present invention provides such a system.

Imperial appointment According to a preferred embodiment of the invention, for use with cable communication systems. Some embodiments include a central control facility and at least is also a wireless data terminal communication system with one remote user facility. This system The system includes a fiber to connect the central control facility to all remote user facilities. feeder cables and drop cables between the feeder cables and each remote user equipment. It is equipped with a cable. This system uses upstream data signals from each remote user facility. , and facilitate the transmission of downstream data signals from a central control facility. this child In order to achieve this, this system further includes the following: They are , converts the upstream analog signal into short high-speed data packets at each remote user facility. and a first converter for converting the short downstream high speed data packets into analog signals; rf-multiplying the high-speed data packets from the first transducer at the remote user facility; Contains high-speed data packets for sending upstream and for input to the first converter. A transceiver for receiving the downstream RF signal and an antenna coupling unit in the center Control equipment (also transceiver transmitting downstream signals and traversing upstream signals) an antenna coupling unit for receiving the upstream signal from the receiver drop cable for transmitting signals and receiving downstream signals from a central control facility. antenna coupling unit of the remote user equipment connected to one corresponding near end of the at least one frequency shifting unit; and a feeder cable and drawer. connected between corresponding far ends of the top cable to provide both upstream and downstream RF signals. for relaying signals to and from the feeder cable. One frequency shifting unit corresponding to at least one user equipment and other system For connection to systems, the upstream RF signal is decoded and the high-speed packets contained therein are for converting standard protocol signals to standard protocol full signals and for converting standard protocol signals from other systems. To convert protocol buckets into high-speed packets and transmit them to downstream remote user equipment The middle of the feeder cable for encoding those high speed packets into an RF signal A second transducer at the control facility end.

The second embodiment is designed for use in wide frequency spectrum cables. How to reuse a narrow radio frequency spectrum for data communication within a geographical area It is. This divides the continuous area into adjacent sub-areas and allows cordless communication equipment of each said sub-region with each set of cordless communication devices. One set operates on the same limited range of frequencies and each cord record within its cent This is done by having communication devices operating on different frequencies. Furthermore, within each sub-area Place each cordless communication device in the set of devices at a specific location within the subarea near the subarea. Cord records that are similarly assigned to sub-regions where many cordless communication devices are in close proximity each code at a particular location to have a different operating frequency than the base communication device. Receiving and transmitting signals from cordless communication devices and to each cordless communication device. Assign an antenna coupling unit for the transmission of signals to each specific position of the cable Each frequency shift unit connected to the antenna coupler unit by position, and the frequency shift unit is assigned to the corresponding antenna coupling unit. the frequency of the signal in the limited frequency range of the cordless communication device received through the numbers to separate frequency bands on the cable over a wide frequency spectrum.

A third embodiment shares a common time-sharing communication channel with different data rates. Limited data capacity between the transmission terminal equipment of a large number of potential users. It is a communication system for sharing quantities. This system supports multiple user terminal devices. and if the terminal device has data to be sent, it polls for data. Each terminal device transmits data on the communication channel when the terminal device is connected to the communication channel. Also this system The system includes a plurality of An upstream polling unit that has a list of addresses for user transmission equipment addresses. and prioritization for dynamically reordering the list of user terminal addresses. It is equipped with a container.

By reordering this list, the upstream polling unit will The user terminal device that returned data most frequently is polled most frequently, and polled less frequently. Reduce the frequency of polling of user terminal devices that frequently did not return data.

The fourth embodiment is a communication system with privacy protection. This embodiment In some cases, the system is connected between multiple downstream cordless terminal devices and upstream terminal units. shared terminals with cordless terminals assigned to different specific locations within the Communication transmission takes place via the cable television transmission path that is provided. This system , each including a unique digital privacy key, at least one It is equipped with two downstream cordless digital terminals. Each terminal device transmits upstream A unique digital privacy key signal encodes the radio signals emitted by By doing so, each terminal device sequentially emits and receives wireless signals. This system The system also provides a means for connecting wireless signals from terminal equipment to the cable television path. Then, the propagation of the upstream signal from each terminal device reaches only the terminal unit placed upstream. while the upstream signal is received by other downstream terminal equipment. at least one cable embedded in the cable television transmission path to prevent a directional coupler and at least one downstream cordless digital terminal device; decodes the encoded signal and specifies downstream cordless digital terminal equipment. using the same digital privacy key used for upstream transmission by , upstream for encoding the signal to that particular cordless digital terminal device. means within a certain terminal unit.

If the fourth embodiment is modified, the updated privacy key signal can be transmitted upstream. inside the cordless digital terminal device to prevent its key radiation into free space. By connecting directly to the TV cable, each downstream cordless terminal device updating its own digital privacy key signal and upstream terminal unit; receives an updated privacy key from each downstream cordless digital terminal device updated privacy keys for those cordless digital terminal devices in response to It is possible to memorize the

A fifth embodiment of the invention is a videotex system using a television cable. It is. This makes TV subscribers no longer need an indoor Videotex display generator. Obtaining videotex samples from the first plurality of videotex sources without I can do it. This system has a separate TV channel assigned to each a shared second plurality of upstream Videotex video display generators, Since the user selects one of the videotex frames from the videotex source, and these user selections can be made by the user via the handbelt TV controller. remote user selection device for communicating to the television set and each handbelt television. decodes the signals received from the controller and selects the to transmit the requested videotex data from the videotex source an upstream decoder for assigning one of the video display generators; ing. Selected video requested by user to complete this operation. The channel number of Otex's channel also changes to the user's remote control unit. This can be conveyed to knits. By this channel number, the selected videotex is becomes available.

A fifth embodiment assigns a user's television set to a remote user selector. to the channel of the videotex generator that was created. Can be done.

A sixth embodiment of the invention provides a cordless terminal and at least one downstream cord. A cable data communication system with wireless terminals that transmits data in high-speed packets. downstream cordless terminals to transmit encoded wireless signals over cables. An upstream polling device for polling and transmitting high-speed packets to wireless signals. , and received from a radio signal and into a format suitable for transmission by standard telephone systems. Equipment to convert existing cordless terminals and cable data communication systems In order to connect to the telephone system of It is a device for adding and adding headers in compatible formats without causing conflicts.

K Naozen Superintendent Eri The invention can be better understood by referring to the accompanying figures. Below they are A brief explanation is given below.

FIG. 1a is a block diagram of a prior art cable television system.

FIG. 1b is a simplified overall system block diagram of the system of the present invention.

Figure 2 is a pictorial diagram of terminating an indoor TV drawer knob cable using the present invention. Ru.

FIG. 3 is a pictorial diagram of an antenna coupling unit of the present invention.

FIG. 4 is a schematic diagram of the antenna coupling unit of the present invention.

FIG. 5 is a pictorial/block diagram of a cable television system using the present invention.

FIG. 6 is a professional diagram of the frequency shift unit and throat of the present invention.

FIG. 7 shows a diplex that allows signal transmission near the feeder amplifier of the present invention. FIG. 2 is a diagram of a filter configuration.

FIGS. 83 and 8b show how the present invention can be used to provide ply tzJ 1 is a schematic diagram of a directional coupler used in a cable television system;

Figures 9a-c are each a front view of a cordless telephone/TV controller of the present invention. , showing the side and back.

FIG. 1O shows a cordless telephone and television combination controller of the present invention. 1 is a simple block diagram of the interface between controller functions; FIG.

FIG. 11 is a block diagram of the cordless telephone of the present invention.

Figure 12: Upstream polling controller and Videotex video display generator of the present invention FIG.

FIG. 13 shows the downstream polling sent by the upstream polling unit of the present invention. FIG. 3 is a timing diagram of signals.

Figure 14 shows a simple diagram of how data rate adaptation works in the upstream polling unit. It is a flowchart.

FIG. 15 is a block diagram of a 5ONET interface unit of the present invention. .

A beautiful day FIG. 1a shows a simplified block diagram of a prior art cable television system. There is. In this illustration, a television program signal 20 is transmitted by a cable headend 22. is received by the fiber optic cable 24 and connected to various feeder cables by the fiber optic cable 24. section 26 where the signal is converted into an electrical signal by an opto-electrical converter 28. Ru. The resulting converted electrical television signal is routed to a collection of feeder cables 32. Therefore, it is transmitted to each neighbor. Some of the television signals on feeder cable 32 A drop cable 36 is distributed to each subscriber's residence by a cable cable 34, and a drop cable 36 is connected from there. is provided to each television set 39 via the television set 39.

FIG. 1b shows the diagram of FIG. 1a in block diagram form, including the additions made by the present invention. This is an expanded block diagram. By adding the hardware of the present invention, the conventional case Expand the Blue TV system to include telephone and other uses.

FIG. 1b shows a TV program source 20, an optical fiber cable 2, as shown in FIG. 1a. 4, shows the electro-optic converter 28, feeder cable 32 and directional coupler 34. Ru.

To understand this diagram, please refer to the Bucket Cordless Telephone 38 (described in more detail below). Begin the explanation with The user has a button on the outside that resembles the keeper throat of a buttonhole phone. Enter the desired telephone number using the very similar keys (keys 40). Voice input is my The received sound signal is picked up by the microphone 42 and sent to the earphone/speaker 44. sound The voice sample was digitally constructed as a high-speed cell rellino (Get 46) and The wireless link is activated only in response to polling signals from the wireless polling controller 56. Antenna Coupling Unit (ACU) 50 (described in more detail below) transmission). ACU 50 includes an antenna that receives signals via link 48. 52 (see FIG. 2) and send their signals to drop cable 36. Doro The signal from the knob cable 36 (i.e. rf modulated) is Wavenumber Shifting Unit (FSU) 54 (described in more detail below) and directionality It is transmitted to the television feeder cable 32 via a coupler 34 . FSU54 is Shift the radio signal frequency to the assigned frequency. This frequency is It is reserved on the feeder cable 32 for this purpose. These signals are , ending in an upstream polling controller (UPC) 56 where they control the 5O NET Interface Unit (SIU) 64 (described more fully below) cell relay suitable for ultimate connection to existing telephone equipment 62 by converted into packets. UPC56 is a physical part of 5IU64, 5IU 64 output signal format 60 is based on the existing SOMET ATM cell relay standard. does not contradict. This allows the existing telephone system to Interconnection with system 62 is immediately possible.

One novel feature of this system of the invention is that it combines videotex with other signals. It is easy to adapt.

Videotex allows users to search data without having to learn computer skills. It is a graphical interface suitable for The public is excited about this new service. An inexpensive Videotex converter is available to test the It didn't exist before I had to spend hundreds of dollars on a custom display generation unit. Videotex services have not been widely accepted, partly due to stomach.

Please continue to refer to FIG. 1b. The present invention provides a set of shared video display generators (VDGs). ) 70 with appropriate hunt rolls. For an average cable system, this utilization of any of the blocks of television channels allocated for the purpose; dynamically allocated on the cable system to use channels that can Each generator will probably be equipped with <6-10 VDGs 70. stop Each VDG will probably contain several different videos that the user might want to see. Deotex sources (for example, airline flight schedules, weather forecasts, or to one of a variety of other databases). Pakeno cordless electrician The signal from story 38 is used to select the videotex source of interest. and use the cordless telephone keypad 40 to (See Figure 10). The called image is , on the television channel assigned to a particular VDG 70 to the television set 39. will be sent downstream. The selected VDG 70 configures the television channel assignments. relayed to the cordless telephone equipment 38. The output is set to 83 channels. It may also be a voice command such as "Ro". TV set 39 to selected channel The tuning function uses the television set's regular remote control infrared link. and command the television set 39 to tune to the selected channel. TV controller 76 and infrared diode 72 in cordless phone 38 It is desirable to automatically do better by including: remote tele Additional features of the behand controller include the addition of buttons and microprocessor By sharing the processing power of the packetized telephone 3 8 can be easily integrated into the container. One way to imagine this The method includes packaging the television controller 76 into a packetized code to form a combined unit. -view as an accessory connected to the wireless phone 38.

FIG. 2 is a diagram of the termination of coaxial drop cable 36 from FSU 54 to a subscriber's residence. It is a diagram. Cordless telephone 38 and cordless data via wireless link 48 rf multiplier signal to or from terminal/computer 80, U of ACU 50 The image is shown being transmitted to the HF antenna 52.

In addition, a television set wired to the ACU 50 via a coaxial cable 36' 39 is also shown. Cordless data terminal/computer 80 is a personal This may be realized by equipping the computer with an RF modem.

Antenna coupler unit 50 Figure 3 shows AC plug set 8 for plugging into a standard wall outlet. FIG. 4 is a front plan view of the antenna coupling unit 50 with 4 provided thereon. ACU50 Inside the housing, the AC plug set 84 connects the power cord of the television set 39. It is connected to a standard socket 82 into which it can be plugged (see Figure 4). Also, Also shown are two F-type connectors for connection with cables 36 and 36'.

Finally, it is also shown that antenna 52 is provided to ACU 50.

FIG. 4 is a schematic diagram of an antenna coupling unit (ACU) 50, which will be described with reference to FIG. represents the identified part. Also, it is connected to the AC plug set 84, and the connector 8 8 to a cordless telephone 38 or other cordless device used in the system. Also shown is a step-down transformer 86 that provides power for recharging the device.

Additionally, a bandpass filter 90 is provided between the antenna 52 and the drop cable 36. , and a band rejection filter 92 is shown between the cables 36 and 36'. It is. The band 902 to 928 MHz, although other frequency bands can also be used. In this particular embodiment, with a bandpass filter 90 that passes the frequency of the The antenna 52 operates in the 902 to 928 MHz band. On the other hand, the band removal filter Router 92 removes frequencies in this band.

The signal to or from the cordless telephone 38 is 902-92 It is a 1.5 Mbit/sec rf burst in the 8 MHz band. antenna coupling Unit 50 picks up spatial wave signals without amplifying them and filters these signals. is a passive device that carries drop cable 36 within the passband of . Also ACU5 0 gets all the signals in the band of interest from the drop cable 36, They are radiated into the air via antenna 52 to provide a reverse channel.

FIG. 5 shows the feeder cable on the ACU 50 and feeder cable 32 in a house 96. 9 is a pictorial/block diagram of the connections between the taps 98. FIG. Each file as shown here. The cable tap 98 is generally configured with four directional couplers 34 as described above. is configured. Also as previously explained, the feeder cable 32 , a connection from the cable television head end 22 via a fiber optic cable 24. from one of the many output taps of the optical/electrical conversion amplifier 28 connected be done. In older cable systems, cable 24 was a large diameter coaxial backbone cable. It can be bull.

Frequency reuse configuration In the 902-928MHz band, the spectral space is only 26MHz. or unavailable, so answer potential requests from all users of this system. It is not sufficient to The present invention is based on a) the use of low power devices; and b) the same technology. Same frequency for each small residential cluster sharing a Levi cable tap 98 Overcoming this radiated rf frequency limitation by reusing several bands . all locally to reuse the same 902-928MHz spectrum. The radiated frequencies are transferred to the television feeder cable by frequency shifting unit 54. 32 into an unused spectrum slot. 902-928M Hz local area band signals at different offset frequencies on the feeder cable 32. Shifting to the wavenumber range means that the limited 902-928 MHz radio The frequency spectrum will be reused. Frequency shift function allows each individual's residence TV feeder cable tap 98 is connected to the TV feeder cable tap 98. Priority will be given to locations where the In reality, it is placed in each individual's residence 96. A directional coupler 34 is installed at this point to separate a portion of the transmitted downstream television signal. used in television cable systems. Generally, about 4 homes fit together in one tap. A separate directional coupling transformer is used for each house. 1 The actual number of homes relying on one-unit Yunobu depends on the density of TV subscribers. do. The present invention uses a small dual transceiver called frequency shift unit 54. at this tap location to receive signals in one frequency range and transfer them to a second Retransmission on feeder cable 32 at radio frequency.

Frequency shift unit 54 FIG. 6 is a block diagram of the frequency shift unit 54 (see FIG. 1b). FSU 54 replaces the current tap 98 (see Figure 5) and is available to TV cable companies. TV signal blocking feature (used to limit the channels that can be viewed) (not shown). Figure 6 shows only the data flow for both times. and does not include cable TV blocking functionality for simplicity of explanation. this What runs through the top of the figure is a portion of the feeder cable 32, and at the bottom: Four drop cables 36.36A to four subscriber residences 96 (see Figure 5) , 36B and 36C. Dope o7 cable 36.36A, 36B and 36 For C, there is a drop-side divider 102 with two functions. One function is The signal 12 is transmitted via drop cable 36 to the four subscribers connected thereto. 6 and the second is to distribute any cordless device on the cable 36. (telephone 38, data terminal 80, etc.) from any of the four houses 96. By combining all 900 MHz signals 46 from the.

Packet signals 46 from the cordless device are provided to receiver 104 . Receiving machine 104 generates a baseband signal 108t-. The baseband signal 108 is U The HF transmitter 110 modulates the UHF transmitter 110, and the UHF transmitter 110 modulates the 900MHz band human power signal. It operates on unused frequencies on other cables, such as 550 MHz. modulated The received signal l11 is input to the divider 109, and the signal is sent to the feeder cage in the upstream direction. The signal is input to the directional coupler 34A which inputs the signal to the cable 32. Similarly, the feeder The downstream 550 MHz band packet signal 118 on the cable 32 is a directional link. The signal is transmitted to the receiver 120 via the combiner 34A and the divider 109. reception The output of the device 120 is a baseband signal 122. Baseband signal 122 i;! , used to modulate the transmitter 124 and the 900 MHz band signal 12 6 is generated. This signal is connected to drop cables 36.36A, 36B, and 3 6C to drop splitter 102 for distribution to connected subscribers. Sent.

There are other ways to shift the frequency besides baseband detection and remodulation. , will be understood by those skilled in the art.

For distribution to drop knob divider 102 for distribution to drop cable 36 Another directional coupler 34B may be used to pick up the normal television signal. stomach.

scramble To better electronically limit the channels each viewer can watch, there are Cable TV suppliers use outdoor scrambling. remote control The outdoor scramble jamming unit that is between the cables 36 and 36. Remotely controlled oscillator in suppression unit is added to the television signal transmitted over each connected drop cable 36. Create a jamming signal. These oscillators selectively jam unsubscribed TV channels Provides all TV bands indoors without the need for individual control electronics make it possible to Signals that require a viewing fee but have not been paid will be interfered with. and can only be seen using a controllable transducer. This converter All cable television signals are shifted to one channel. cable The remote control that comes with compatible TV sets does not appear to be It can be used for.

The ideal location of the scrambling device is the preferred location of the frequency shifter unit 54 of the present invention. Since the desired location is the same, the FSU54 is conveniently incorporated within the suppression unit. Good. Examples of this type of suppression unit are for example Pierre Blais. No. 4,991,206. This particular suppression unit A block is a jamming signal that operates at a higher scan rate than the television's horizontal sync rate. to take control of the horizontal sync timing of individual TV sets.

Control of TV signals only downstream Figure 7 shows the normal TV feeder extension amplification. Feeder cables to illustrate how the devices 130 and 132 are accomplished. 32 is a block diagram of a portion of the computer. Amplifiers such as 130 and 132 typically Approximately every 1000 feet of feeder cable 32 is included. many tele The Bifida extension amplifier uses a Guiplex filter at the input and output sections of the amplifier. It is made with a gap for insertion. Today, it is used for transmitting television signals. 5o to 450MHz bypass filter and a rotor in the range of 5 to 30MHz. - Dibrex filters combined with pass filters are used in upstream control systems. used for systems. In the present invention, the bypass section carries the television signal downstream. A guibrex filter is used to enable bidirectional transmission. It could be changed.

In the diagram, this means that each amplifier is Connect the TV feeder extension amplifier in the place where the equipment is placed to a pair of low This is accomplished by making connections between the path parts. diplex fill The bypass section of the controller passes signals in both directions in the range of approximately 500MHz to IGHz. . On the other hand, the low-pass part, in combination with the TV feeder extension amplifier, Passes signals in the 400 MHz range only in the downstream direction.

Therefore, starting from the upstream end of cable 32 on the left side of FIG. 7, the downstream video signal is It is divided by a diverx filter 134. The low pass arm 142 is The bypassband signal is conveyed to a television feeder extension amplifier 130. tv feeder extension The long amplifier 130 has an amplified signal input to a second dibrex filter 136. A television passband signal 144 is output. The amplified television passband signal is The downstream RF flaw signal is combined in a second Guiplex filter 136 and fed to the feeder. It is input to the next section of cable 32. Three directional coupler taps 98 This section of the carder cable 32 is shown. The high frequency signal 146 is and downstream, and is bypassed near amplifier 130. digital phone call The unamplified, higher frequencies used for broadcast signals are lower than the downstream TV band. , will be more attenuated. Unlike television signals, digitally modulated telephone The signals can tolerate low signal-to-noise ratios, and many uses allow bidirectional transmission of these signals. No amplification is required for use.

In particular, in the present invention, the upstream and downstream rf digital signals are multiplexed on the time axis. transmitted on the same frequency band. Therefore, both digital channels are Both streams share the same bandwidth.

To the right of the directional coupler tap 98 is another filter amplifier combination, 1 There are 32-138-140. This is the same as the filter amplifier combination on the left. 7 and other sections of downstream feeder cable 32 similar to that shown in FIG. It is connected.

Prevention of unnecessary radiation Other services that use cable TV spectrum, such as air navigation, To detect and remediate signal leakage that could cause interference to For cable television systems, ensure that the system operator has performed current emissions testing. It is mandatory to do so. The TV feeder cable 32 is used for high-intensity TV signals. transport the issue. These signals are reduced in amplitude as they enter the drop cable 36. do. Lower signal levels on drop cables produce higher levels of radiation Although they are of less concern, they create a greater chance of failure. TV show The rope cable must be mechanically flexible. Therefore, the drop case cables whenever their connectors become corroded or their flexible protective coverings They tend to radiate when the covering wears out. flexible tv drop cable 36, the TV feeder cable 32 has a seamless aluminum sheath. It is a tube.

In the present invention, all offset frequencies are It is confined only within the ibar path. This typically allows cellular phone Enables reuse of frequencies used for services that use space waves, such as wireless. become capable.

Privacy protection Figures 88 and 8b illustrate a new secret system for use in cable television systems. It is listed. This is a privacy policy generated at the user end of a bidirectional transmission path. - Directional couplers 34 and 35 are used to convey the key signal. Figures 8a and 8 As schematically shown in b, two different subscribers are served in a feeder cable 32. directional couplers 34 and 35 for providing services. These figures smell , each of A and B represents a user device, such as a bucketed cordless telephone 38. are doing. In FIG. 83, device A is B (upstream polling controller 56). The data bucket 111 is sent upstream via a directional coupler 34 that terminates.

When the bucket 111 goes upstream from A to B, the directional coupler has a high directivity characteristic. If we assume that C is not received. In reality, the signal received at C is It's so weak that it can't be released. Figure 8b shows that C can fully hear B's transmission to A. ing.

In the present invention, B uses traffic that A understands and C does not understand. A takes advantage of this asymmetry by sending B the code it uses to Ru. From time to time, A sends B a randomly selected privacy key bucket 111.

After receiving this key from A, B uses this key to encode the message from B to A. use the key.

The use of privacy keyfoods is an old technology. Wide (used and One example suitable for bucket transmission is U, S, National Bureau f 5 standards DES algorithm. This algorithm is It uses a 48-bit key known only to the sender and receiver. This common The key is transmitted to produce an undecipherable string of binary bits. used for the purpose of processing data streams that are The same key will change the string by a collection of recipients to unambiguously decode into a digital data stream. used in the opposite direction. The DES algorithm must be used in the present invention. (This is for illustrative purposes only.)

Other privacy-preserving algorithms can also be used.

One key may be used for a fairly long period of time, but changing the key frequently , resulting in higher safety. In the present invention, in order to do this, a new random number A key bucket is created and the upstream polling control is performed by a cordless phone. Sent to knitting. from a radiating cordless phone or other rf terminal device. direct physical connection to the antenna coupling unit) 50 when transmitting the key bucket. This connection would prevent accidental release of the key bucket. drop cave At the end of the cable 36, instead of the signal normally being received via an antenna, the signal is sent directly to the It will reach up to rope cable 36.

This hardwired connection is only used when changing keys and is provided by nearby receivers. This will prevent emitting key transmissions that may be picked up.

automatic key update The process of changing the battery is automated and the phone usually uses its battery recharging unit. Happens when you are returned to. A physical connection that occurs in the moment allows cordless phones to A direct connection between the drop cable 36 and the drop cable 36 is made.

By using the design described here, a single approved terminal end Only the downstream data stream can be decoded. Other equipment on the feeder cable devices can "hear" the packets being transmitted, but the packets are not transmitted to those devices. Therefore, it cannot be decrypted.

cordless device Figures 9a-c respectively show cordless telephone/TV controllers according to the present invention. The front, side, and back of the roller 38 are shown. Figure 98 shows a fully integrated telephone handset. General design: speaker 44, keypad 40, and microphone 4 FIG. Figure 9C shows the TV monitor remote controller. This is a typical configuration of buttons for users to receive Videotex information. You can view a list of several source titles on the TV screen so that you can choose from a variety of titles. In addition, the SEL key 190 can be connected to the numeric keys to select the video you want to use. It is provided so that the user can select a tex source from a displayed list.

FIG. 1O shows the internal circuitry of an integrated cordless telephone/TV controller according to the present invention. FIG. 2 is a simple block diagram showing the path configuration.

Keyboards 40 and 76 allow users to access microprocessor 180 and its associated menu items. It is illustrated as providing an input device for inputting data to memory (RAM & ROM). It will be done. This microprocessor connects the antenna coupling unit 50 through a wireless link. (not shown) and associated components of the cable system communicate with the upstream polling unit (not shown). 56. User is in phone mode or videotex mode Depending on the It is this link that communicates with the videotex generator 70 and the videotex generator 70, respectively. Ma Additionally, what is shown in Figure 10 is the microprocessor in videotex mode. LED driver 182 under the control of the server 180 and the IRRA of the television monitor 39 Its associated LED 72 communicates with M184.

FIG. 11 shows an integrated cordless telephone 38/TV remote control according to the present invention. FIG. 2 is a block diagram showing a unit.

The core of the remote device is a microcontroller 180 and associated RAM 18. 4 and ROM186. The user can use the cordless telephone key 40 or the television Interacts with microcontroller 180 by remote control key 76. - Face. The LED 72 also shown in the figure is a TV remote controller. operated by the controller and interfaced with the television set 39. Ru.

In telephone mode, audio signals are received by microphone 42 and transmitted to amplifier 20. 0 and then sent to an analog/digital converter (A/D) 204.

The 8-bit parallel sample from A/D 204 is retrieved from ROM table search 206. is converted to 12-bit parallel samples using This 12 bit sample is , to buffer 208 and then 96 by parallel-to-serial converter 210. Pinoto's output is converted into serial packets. This 96 bit packet is sent to the upstream channel. is applied to a gated sawtooth oscillator 212 to generate a signal, and the oscillator 21 The modulated signal from 2 is provided to a time division multiplexer 214. Out bucket is forwarded to antenna 52' for wireless transmission to the antenna interface unit. The outgoing transmission is routed to the upstream polling port before being routed from there to the feeder cable 32. It waits for a polling signal from the monitoring controller 56.

Similarly, other signals transmitted upstream are generated by microprocessor 180. , given to the ROM 206 for 8/12 pit conversion, and for the above audio signal. Perform subsequent transmission in the same manner. 12-bit encoding allows transmission of control functions and error detection becomes possible. The signals generated by microprocessor 180 are named Privacy key signals and videotex requests and selections, to name just two. It also includes the transmission of selection signals.

The incoming downstream signal is received by the cordless device via antenna 52'. It will be done. This signal is provided from antenna 52' to time division diplexer 214, It is then applied to receiver amplifier 216. The amplified signal is sent to mixer 218 and there mixed at the frequency of local oscillator 220.

The signal from this mixer 218 is given to an intermediate frequency amplifier 222, and the block 2 24, amplified, clipped, and shaped. The incoming downstream signal is essentially Being a phase tuned signal, the incoming data stream phase is determined at block 226. locked. This phase-locked serial data stream is a serial/parallel input to ROM 230 and input each 12-bit word to ROM 230 once. is converted into a parallel word. The ROM230 stores the incoming data The signal stream is decoded into commands and data. command is microphone The data is sent to processor 180 and directed to ROM 232 .

These commands include ``send next packet, shorten the ring tone for r'ii talk twice.'' It includes commands such as "make the sound louder and ring longer once." If the incoming command "Send next packet" and is ready to send a complete short audio packet. For example, the serial output from the parallel/serial converter 210 is sent to the sawtooth oscillator 212. is turned ON and OFF, and this signal is sent to the diplexer 214 and the antenna described above. Send it through 52゛.

In response to the "Ring" command, the multiprocessor 180 sends a ring data signal. generate a number. This signal is given to ROM 232, where the following received Processed in the same way as data signals.

The data signal from the 12/8 bit converter 230 is provided to the ROM 232, where it is It is converted into an 8-bit digital word and sent to the digital/analog converter 234. is sent to the earphone, amplified by amplifier 236, and finally sent to the earphone to create an audible sound. The signal is sent to a speaker 44 or a bell (not shown).

The generation of key privacy codes in cordless devices is performed using random number generator software. Through the intervention of and is completed. Typically, a cordless device is connected to its battery charger ( 4) starts the random number generator, thereby generating a new key code. A code is generated. This charger is placed inside the cradle where you place the cordless device when not in use. Can be stored.

A routine stored in ROM 186 is used to select the Videotex source. You can also do that. The user presses the phosphor button 188 in FIG. Enter the number of the TV controller 76 into the keypad of the TV controller 76, and This routine can be activated by pressing the rsELEcTJ button 190 on the controller 76. The engine starts. By this operation, the signal given to ROM206 is the upstream port along with the user's request for videotex information. An upstream signal is sent to the ring controller 56. As will be described later with reference to FIG. The upstream polling controller 56 then receives the requested videotex. Assign the signal to one of the Videotex display generators 70 (if available) Ru. Once this assignment is complete, the upstream polling controller 56 to send a signal to the cordless device 38 to send the requested videotape on which channel. notify the user that a text is available, or automatically Tune the TV 39 to the appropriate channel via the TV controller 76.

According to a preferred embodiment of the invention, a code record is The telephone 38 (or computer 80) is an FC used in a thermotherapy device. C (Federal Communications Co+u+1ssion ) operates on the designated ISM (industrial, scientific, medical) 902-928 MHz band.

In the United States, if you use spread spectrum signals, you are communicating in this band without permission. is allowed.

Energy density spec to meet FCC spread spectrum energy allocation requirements. By selecting short burst-like 1.5 Mbs pulses to generate torque, Unauthorized operations on this selected shared band become possible. In the United States, other radio Wavebands have also been approved for new service projects and have been opened up and used in recent years. It is planned that this will become possible. You can also connect directly by using existing wired telephone equipment. It also becomes possible.

Voice data rate compression using high-speed packetsIn high-speed packet voice transmission, the silent period There is no need to create packets, the threshold voice detector blocks silent periods, The transmission device uses the channel only momentarily. Statistics for such intermittent user loads averaging significantly increases the number of devices that can use a common shared channel . For example, four units on a shared feeder tap 98 may be connected to a single channel at 1.5 Mbps. If all four households are allocated, the combined load from all four households would be 1.5 Mb s. / s e c peak 2-way data capacity is limited.

Generally, only one person speaks during a conversation, and there are also pauses between syllables, so The effective data rate of the ADPCM channel of 32kB/sec is This produces an average voice load of approximately 12 KBs/sec per person. to this increases the number of simultaneous audio channels that can be supported through feeder tap points. increase.

Upstream polling controller 56 FIG. 12 is a block diagram showing the upstream polling controller 56 and VDGs 70. It is. As shown, the UPC 56 includes a feeder cable that receives upstream signals. An rf encoder/decoder 316 is included that sends downstream signals on 32. encoder/decode The encoder 316 has its associated RAM 308 and ROM 306 an instruction set and storage locations. It interfaces with a CPU 304 (eg, a microprocessor) that has a CPU 304 (eg, a microprocessor). Also , an rf encoder/decoder 316 connects the received signal to a standard telephone system. If you want to use telephone communication as shown in Figure 15, the signal is It is sent to unit 64. In addition, there is also a memo that interfaces with the CPU 304. There are three RAMs, including a priority allocation RAM 310 and an address search RAM. 312 and a key EPROM 314. It is clear from the description in Figure 13 below. However, the priority allocation RAM 310 polls the list of the user's cordless devices. They are maintained in the order in which they should be run. Basically, the code that most recently sent data upstream is device that is polled more frequently than a device that is less active. ordered so that

The address search RAM 312 stores information for each user cordless device currently on the system. Has a system address. Run this memory as RAM instead of ROM This allows users to The list of terminal device addresses is easily updated at any time. Priority assignment and privacy – Address information stored here, including keying of downstream signals for protection , UPC56 functions.

Cow-EPROM 314 stores the most recently used key code of each user terminal. Used by the UPC 56 to maintain a list of . Only the desired user terminal A CPU 304 and an RF encoder 316 connect each downstream transmission so that the downstream signals can be decoded. It is the E PROM314 that obtains the appropriate privacy key code to be used for It is et al.

An upstream polling controller 56 receives video data from one of the user's terminal devices. When a request from the CPU 3 is received, the signal is decoded by the decoder 316 and sent to the CPU 3. Sent to 04.

The CPU 304 sends the selected videotex signal to the requesting user. to feed downstream via feeder cable 32 to the Videotex source selector. 302 and the Videotex channel encoder 300. videotape Simply put, the channel encoder 302 is the channel encoder 30 that can be used. User-selected video signals from video sources greater than 0 are selected by CPU 304. This is a switch for sending the selected Videotex channel encoder.

FIG. 13 shows the downstream bitstream 11 sent from the upstream polling unit 56. 8 and shows the polling response. Each cordless telephone 38 has an upstream port The polling unit 56 receives a stream of polling data from the polling unit 56. This allows the receiver 216 for adjusting its automatic level control circuit elements. A continuous signal is given. The data is sent as a 12-bit code, each The code can be a control signal or an encoded 8-bit byte.

Because of this 12/8 redundancy, do not allow incorrect symbols to be accepted and , the error detection mechanism allows special control characters to be sent as a single symbol. become capable.

The message sent downstream by the upstream polling unit 56 includes (1) information for transmission; There are two types: polling requests, and (2) data streams sent to specific terminal devices. There is. A single poll symbol can address 256 terminal devices. However, with two such signals, 65,000 units (256X256= 65,536) devices. Outgoing polling sequence The repetition rate depends on the expected worst round trip delay. For example, maximum feeder cable If part 32 is limited to 1 mile, the round trip delay is (2/186,00 0 =) 10.75v microseconds plus cable transmission line propagation delay Become. Assuming a 1.5Mbit/sec bit rate, 24 bits time is appropriate.

In other words, for a 12-bit polling symbol, the upstream polling unit 56 If no input arrives within 24 bit time, sends next polling signal. Wait for 24 bits. If transmission has started, the next poll will be for packets Delayed until the whole arrives. at least once every millisecond, or the audio At least once every 2 milliseconds to reduce transmission delays, each cordless telephone38 receives inquiries. In other words, 64Kb/5ec (worst case) means 64 bits. Tsuto's information will be sent. Using a 12-bit symbol, this results in 8 pits. This would result in 96 bit cell packets corresponding to an interval of 12 samples.

The signal level from each terminal device is checked by upstream polling unit 56 at the previous signal limit. arrive at. As a result, this information is used to set the receiver gain at the same time as polling. It can be used for various purposes. For example Eva, each cordless device is polled so the system is Know in advance the signal strength history of previous polls and adjust the received signal level accordingly. can be set. Until the polling signal is received from the upstream polling unit 56. It was noted that the terminal equipment cannot send its own packets during stomach.

There is a shortage of spectrum space available for unlicensed operations. make the most of it For the purpose of avoiding line contention, the upstream polling unit 56 uses special The polling symbols are issued in sequence. Each poll symbol is a set of polled Addresses a specific terminal among the terminals (FIG. 9). Terminal device inquired has a packet ready to be sent (device X in Figure 13), then the roll Processed as such immediately after a call inquiry, otherwise the next device is Will be polled.

a. Adaptive polling packetization If the terminal has nothing ready to send, the next terminal device in the collating order list location is polled. Each time each terminal device responds to its inquiry poll , its position in the sampling queue is determined by the prediction of the next packet from that device. It will be corrected according to the estimated time. Unresponsive device 4 in inquiry queue Reduced priority and polled less frequently. With this kind of mechanism , high data rate devices such as combi coaters and extremely low data rate devices such as burglar alarms. An adaptive data rate channel can be established that can support both devices at the same time.

b. virtual circuit Can be maintained for large numbers of simultaneous packetized voice conversations and Maximize the number of virtual circuits to minimize delay and overhead load. It is a purpose. The sampling rate is such that on a statistical basis most audio packets are lost. and to ensure that no significant delays occur in the audio signal transmission process. Yes, it is selected dynamically. Minimum sampling rate allows for standby-to-active To enable a quick transition, all authorized terminal devices must begin transmitting after a period of inactivity. guarantee that it is detected from the beginning. A short delay occurs simultaneously with the startup transition, but this represents a delay of less than 2 seconds, and is operationally comparable to traditional analog telephone systems. It's comparable to waiting for a dial tone.

FIG. 14 shows the polling schedule executed by the upstream polling unit 56. This is a simple flowchart. The purpose of this process is to Rapid polling and dynamic change methods reduce unused equipment. The key is to poll frequently.

All valid device addresses are maintained in RAM 312 (FIG. 12). during integration The polling period is 24 milliseconds and no energy is received within this period. If so, it is assumed that the addressed device is responding. valid packet The time allowed is determined by a table lookup and depends on the type of device being transmitted.

Polling is temporarily suspended during this period.

At decision block 238, the UPC 56 has been active for the last 0.002 seconds. The user terminal asks if there is an incoming conversation schedule. Iriki conversation schedule If so, the UPC 56 polls (blocks) those user terminals. 245) L, then the received data to determine whether it is in the form of a valid packet. (block 246). If it is not a valid packet, the control returns to block 238. If the packet is valid, it is received (blocked). block 248), reads the privacy key, stores it in RAM 314, and blocks it. 244), the downstream signal to that user terminal is encoded with the same privacy key code. After making a note of the address of the source (Pro 250) so that The troll returns to block 238. If there is no schedule for incoming conversations (block Lock 238) is the downstream traffic waiting to be sent by UPC 56. Control passes to decision block 240 to determine whether the ・Tsuku240). If there is downstream traffic to be sent, it is sent (block (lock 242), control returns to pro-tock 238. Downstream tiger in standby state (block 240), if the user equipment in the bank ground (recently (devices that are not transmitting) are polled (block 252) and the UPC 56 Wait for reception of a valid packet (block 254).

If all valid packets are not received, control returns to block 238. , if a valid packet is received, the last Priority scheduling for inclusion of recently rebooted user terminals into the window of block 238 Add to the module (block 256).

Signal strength fluctuation Time-order multiplexing of digital signals from each cordless device requires significantly different distances. Each cordless device operating in the required. Furthermore, in the future many different services will share the 1MS band and code signals from wireless equipment must be able to tolerate high levels of background noise. It is expected that In the present invention, (a) short burst signals are b) use a receiver with a wide dynamic range; C) Supports cordless telephones 38 being widely removed from normal drop termination points cord recorder, such as using a separate drop cable 36, when necessary. This can be achieved by having a base device. Signals arriving at upstream polling unit 56 The upstream polling unit The signal from cut 56 is received at the same level. The upstream polling unit 56 These expected levels and timing can be predicted using the polling function, It knows which device will transmit next.

virtual circuit loading By not sending silence, you can reach a large number of potential users with less overhead. Simultaneous virtual circuits are possible. Keep the entire voice channel open for the duration of the call. Unlike traditional circuit-switched systems, where virtual circuit load It is reasonable to assume that not everyone will request access to the communication source at the exact same time. It is based on statistical assumptions.

Even if there is a slight increase in the virtual circuit cost, data can be transmitted in an active state. It is possible to set up and maintain a large number of simultaneous virtual circuits that load the system only when can.

No load is provided except when the Combiator is actually transmitting or receiving. semi-permanent computer-to-computer interconnections become viable. . Using the adaptive scheduling algorithm described above, given the total traffic A large number of increasingly frequent transmissions occur before a block is processed. With each iteration , more system unused capacity due to reduced polling interval to next sample becomes available.

Implicit address referencing The polling process, which addresses all potential transmitters of a group of houses, from the ring converter 56.

Because this polling device implicitly knows who is transmitting at any given time, the address header bits on its upstream stream. There is no need to This information has already been informed to the upstream polling controller 56. and controller 56 selects the correct path for further transmission upstream. , add goo.

Cell relay switching Cordless telephone terminal equipment uses short, high-speed packets all of the same length, more precisely Generates cell relay packets. This format allows transmission at a sufficiently low level data streams that can be easily converted to standard 5ONET format. Together, it becomes possible to generate a system. In addition, the current high-speed S ON ET ATM (Asynchronous Transfer Mode) Optical transfer mode of Cell Relay compliant format for seamless integration with AIVA transmission systems enable execution. And the Batcher-Banyan type currently under development. High Speed Packet Switch (McDonald).

John, Editor, FUNDAMENTALS OF DIGITA L　5WITCHING.

Chapter 4. ”PACKET 5WITCHING-by Paul Baran, 2nd Edition.

Plenum Press, 1990) can also be easily integrated.

At the heart of this system is a unique high-speed packet-switched compression mechanism that There is no need to switch anything if no signal is transmitted. Only active packets are disconnected. The switching network is much smaller than that required with traditional channelization circuits. network can be used. If it complies with 5ONET ATM standards, the current 5ONET, which allows for easier interconnection with the telephone network that is progressing towards ATM transmission. Ru.

5ONET interface unit 64 Figure 15 shows the 5ONET interface unit of the present invention. FIG. 3 is a block diagram showing the interface unit 64; On the left, a high-speed packet signal is received from UPC56 and sent to UPC56, and on the right side, the signal is 5ON The data is sent to and received from the ET high speed packet switch 66.

Starting from the left side, high-speed packets to be transferred to the standard telephone system 7) The exchange Received. The signal is provided to an rf receiver 318 and multiplexer 326 is demodulated and provided to debaquenotizer 320 before being provided to one of the inputs of . To simplify the diagram, only one receiver 318 and debakenotizer 320 are shown here. Illustrated. However, it is possible to collect one or more signals to be fed into a standard telephone system. To accommodate this, a typical system includes a receiver 318 and a device There will be multiple routes. Each debakenotizer 320 in this system The output signals from the It is given. A multiplexed version of these signals is 28 to provide an outgoing signal to the fiber optic cable of a standard telephone system. and is provided to the optical driver 330.

The incoming portion of the telephone call is received by an optical receiver 332 from which the output signal is simply A one channel SONET bucket buffer 334 is provided. Receiver 318 and device As described above with respect to the telephone call 320, a separate There are also optical receivers 332 and buffers 334; Only one channel of the item is shown. Output signals from each buffer 334 The signals are provided to input ports 338-340 of multiplexer 336. and, The multiplexed input signal is provided to a bucketizer 342 and then to an rf transmitter 34 4 and finally to the UPC 56.

Feeder frequency assignment A new generation of cable TV feeder taps is now used for TV transmission Designed to handle a wider range of frequencies. Frequency higher than IGHz Some companies offer passing taps. 50 TV channels cable system requires only a frequency range of about 300MHz, which ranges from about 5° to 350MHz. It is thought that the As a result, from about 350MHz to perhaps <800MHz The remaining spectrum is left unoccupied and ready for use in the present application.

The 902-928 MHz radiation band supports only about four simultaneous 1.5 Mbps channels. However, if you include a tolerance for the modulation sidebands, you can also use simple modulation. If you have one, it can support two 3Mbps. On the other hand, the feeder cable 32 is Carrying approximately 75 equivalent channels at frequencies ranging from 400 to 850 MHz I can do it. In this way, multiple reallocations of emission frequency bands are possible.

The harmonics from the television signal carriage are in the digital signal band, but are analog Unlike television, digital modulation requires extremely low signal-to-noise ratios. Therefore , even with background harmonic distortion noise, currently unused frequencies The number range is more than adequate for the purpose mentioned above. In the future, some of this extra bandwidth will be It may be used for the carriage of digital televisions. However, in the foreseeable future Therefore, even if this were to be realized, there would be more than enough extra capacity to implement the present invention. I think that the.

videotex Another feature of the invention is the ease of integration of Videotex into television cable systems. It's there. Videotex is a keyboard search of information frames that locally or retrieved through a data channel. real videotape A box frame begins with a densely compressed and stored digital description and is a video representation. The display generator (VDG) 70 expands the display to a wide variety of displays. In the present invention, video display A shared bank of generators 70 is located upstream. Each video display generator 70 has a separate Operates on TV channels. What is the keypad signal from the cordless phone 38? Tells the system which video tex screen is being requested and displays the video. One of the generators 70 is temporarily assigned to the requesting user. These V Since DG70 is time-divided, the text is assigned to the assigned VDG70. It is necessary to set the Levi channel selector. For example, recorded audio tunes the television set to the correct frequency by sending commands to the user's phone. Assignment VDG channel information can be sent downstream in order to more preferable According to a new design, an infrared radiation source 72 is added to the subscriber's cordless telephone 38 to Converting a dress phone 38 into a complete hand belt TV controller 76 , the TV channel can be selected locally using the control of the upstream VDG70. It becomes possible. This same unit includes a hand belt television controller 76 and and functions as a cordless telephone 38.

The above description mainly relates to the implementation of the invention and includes specific techniques related to preferred embodiments. is expected to change over time. For example, the TV feeder cable Instead, it is envisaged that fiber optic trunks will be used. The concept of the invention is broadly Terms such as cordless data terminal equipment are used to refer to wireless LAN and the same system. Includes wired devices as long as they can handle hardwired devices in addition to cordless devices I hope you understand that.

As will be understood by those skilled in the art, this invention departs from its spirit and essential characteristics. It can also be implemented in other forms.

The scope of the invention is limited only by the appended claims.

Copy and translation of written amendment) Submission (Article 184-8 of the Patent Law) March 17, 1994

Claims (8)

[Claims] 1. A wireless data terminal communication system that includes a central control facility and one or more remote units. A field that connects the user equipment, the central control equipment, and all the remote user equipment. a drop cable between the feeder cable and each of the remote user equipments; A system having a cable from each remote user equipment. for transmitting upstream data signals and downstream data signals from the central control facility. A system for transmitting upstream analog signals at each remote user facility. converts downstream short high-speed data packets into analog signals. a first converting means for converting the high-speed data packets from the converting means to an RF signal; a high-speed data packet to be sent upstream as a signal and provided to the first conversion means. transceiver means for receiving downstream RF signals at each of the remote user equipment; The antenna connection unit transmits signals upstream to the central control facility and The corresponding part of the drop cable is configured to receive downstream signals from the central control facility. is connected to one near end of the transceiver means for transmitting the signal downstream to the transceiver means. an individual target also having an antenna for receiving upstream signals from the transceiver means; an antenna coupling unit in a remote user facility; one frequency shifting unit corresponding to each of the one or more remote user equipments; one or more frequency shifting units, the feeder cable and the drop cable; one corresponding far end of the feeder cable, and the upper end of the feeder cable. for converting the frequency of the current rf signal and the downstream rf signal from the feeder cable. one or more frequency shifting units and for connection to other systems, said upstream Decodes the rf signal and converts the high-speed packet signal contained therein into a standard protocol packet. standard protocol packet signals from other systems. convert signals into high-speed packets and transmit them downstream to remote user equipment. Central control of feeder cables to encode packets into rf signals and a second conversion means at the equipment end. 2. Wide frequency spectrum to narrow radio frequency spectrum for data communication in continuous area A method of reusing for use in cables, (a) dividing the continuous region into adjacent sub-regions; (b) - the set is divided into steps; A set of cordless communication devices corresponding to each sub-region of Each set of wireless communication equipment operates on the same limited range of frequencies and A process for assembling multiple cordless communication devices so that each device operates on a different frequency. Tep (c) each in said set of devices of step (b) in each sub-region of step (a); A cordless communication device near the boundary of the sub-area can similarly allocate a cordless communication device. Cordless communication equipment in the adjacent subarea being addressed has a different operating frequency. (d) allocating to a specific position within the sub-region so as to receiving a signal from each cordless communication device at each particular location; In addition, the antenna connection unit for transmitting signals to each cordless communication device is allocated. step to guess (e) connected to the antenna connection unit of step (d) by a cable; of the cordless communication device received via the corresponding antenna connection unit. Convert the frequency range of the signal frequency to another frequency on the wide frequency spectrum cable a frequency shift unit for shifting into bands at each particular position in step (c); A method characterized in that the method comprises the steps of: assigning a position to a position; 3. Many potential users with different data rates sharing a common time-sharing communication channel A communication system for sharing limited data capacity between transmission terminal devices. , if each terminal has data to be sent, it is polled for data. a plurality of user terminal devices transmitting data over the communication channel when the plurality of user terminal devices for polling each of the plurality of user terminal devices in turn; an upstream polling unit with a list of addresses of terminal device addresses; , select the user terminal device that most frequently returned data when being bored at the upstream point. The address of the user terminal that the polling unit polls most frequently. A user terminal device that dynamically reorders the list of and returns data less frequently. A system characterized by comprising: an update means for reducing the frequency of polling; Tem. 4. A communication system that includes privacy protection features and that connects multiple downstream cordless Communication is transmitted between the terminal equipment and the upstream terminal unit over a shared cable television transmission path. and the cordless terminal device is assigned to a different specific location within the system. A system that is one or more downstream components, each containing a unique digital privacy key; -less digital terminal device, in which each terminal device sequentially emits and receives wireless signals. and each cordless digital terminal device transmits the emitted wireless signal upstream. means for encoding digital privacy key signals that do not overlap with each other a downstream cordless digital terminal device having; means for connecting the wireless signal from the terminal device to the cable television path; The reception of upstream signals from each terminal device is prevented by other downstream terminal devices; To restrict signal transmission to reach only upstream terminal units. , one or more directional couplers embedded in the cable television transmission path, and the one Decodes encoded signals received from downstream cordless digital terminal equipment and transmit the signal to a particular cordless digital terminal to its downstream code. the same digital network used for upstream transmission by the wireless digital terminal equipment. A means in the upstream terminal unit for encoding using a bus key and, A communication system equipped with 5. 5. The communication system of claim 4, wherein the one or more downstream cordless devices Each digital terminal device transmits the updated privacy key signal to the upstream side. Inside the cordless cordless cable, to prevent radiation of its privacy key signal into free space. By connecting the digital terminal directly to the TV cable, you can update the privacy key, and periodically transmit the updated privacy key signal. means for transmitting the information to the upstream terminal unit; said upstream terminal unit in response to receiving said updated privacy key therefrom; and the privacy of each of the one or more downstream cordless digital terminal devices. A communication system having means for updating keys. 6. TV subscribers can use the first Videotex samples can be obtained from multiple Videotex sources. It is a Videotex system based on TV cables, and the TV cables are self-contained. A system having user television sets connected to the body, each with a separate the same or smaller number of TV channels assigned to the first plurality. a second plurality of shared upstream videotex display generators; The user selects a videotex frame from said first plurality of videotex sources. and select one of these handheld televisions. the user's television set connected to the television cable via the controller; and equipment for remote user selection for relaying through each handheld television. Decodes the signal received from the controller and selects according to the user's request to transmit the requested videotex data from the requested videotex source. an upstream location for allocating one of said second plurality of video display generators to and a decoder for remote user selection, the device for remote user selection relays the channel number of the channel with the selected videotex requested by The Videotex system also has the means to 7. A videotex system based on a television cable according to claim 6. and the device for remote user selection is configured to allocate the user's television set. and means for tuning the channel of the videotex generator. 8. encoded along with one or more downstream cordless terminals and high-speed packets of data. the one or more downstream cordless cables for transmitting wireless signals over the cables; A means for polling a terminal, including a polling means placed upstream of the terminal. , Transmit high-speed buckets to wireless signals, receive from wireless signals, process high-speed packets, and to convert the signal into a format suitable for transmission over standard telephone systems. equipment, cordless terminals and cable data communications systems to existing telephone systems. high-speed packets, consistent with ATMSONET standards. a means for adding headers in a format compatible with Cordless terminal and cable data communication system system.